Electricity through walking

1. Presented by:-
Amal Mathew

3. • Human walking carries a lot of energy,Theoretical estimates show that it
can produce up to 10 watts per shoe,and that energy is wasted as heat.
• The advance could provide a source of power to people in remote areas
and developing countries that lack adequate electrical power grids.
• This coild be especially useful for the military,as soldiers currently carry
heavy batteries to power their radios,gps unit and night vision goggles in
the fiels.
• To generate power from walking we can make use of two phenomenon
1).reverse electrowetting effect
2).piezoelectric effect

6. The reverse electrowetting effect has been
defined as "the change in potential difference
between the solid and the electrolyte due to
solid-electrolyte contact angle
Conducting fluid
Thinfilm dielectric
Metal electrode

7. Youngs Equation
Surface energy
Contact angle
Wetting
Youngs equation
σsg =σsl+σig.cosθ
σsg
σsl
σig
θ Contact angle
Surface tension of liquid
Interfacial tension between liquid and solid
Surface free energy

9. How perfomance can be modified
• More energy is generated when the
conductivity of the fluid is more
• Electrode material of low conductivity is
preferable
• Making the channel length more
• Use more droplet ,there by we can increase
The effective area

10. Challenges
• Energy produced is very less
• Device manufacturing for practical purpose
• Liquids exhibits saturation phenomenon

11. In piezoelectric material an applied
mechanical stress will generate a voltage
Applied mechanical stress
Change in
potential difference

12. Bridge rectifier
Piezo electric
material
capacitor
The storing energy can be calculated by this equation:-
E= ½ *CV²
E= ½ *(22²)*22*10¯⁶=5.324*10¯³
E=5.32 mj
E/step=5.32/60=8.866*10¯⁵ j
=88.66 µj
My smart phone battery needs
5.7 wh
Ie; 5.7 wh=5.7*3600 j
=20520 j
So, to produce 20520 j energy,
for that we have to walk 23
billion steps

14. www.Wikipedia.org
www.nanomotion.com
www.explainthatstuff.com
www.rapidtables.com
www.instructables.com
www.makezine.com
www.hyperphysics.phy-astr.gsu.edu
www.wired.com
www.googlesciencefair.com
www.youtube.com
www.memsjournal.com